[CSV Exporter] Update prepareMeasureSearch to Support search_after

[Juiced66]

Description

Refactor the prepareMeasureSearch method to support pagination using the search_after parameter.
This intend to bypass Elastic Search 10K row limitations by using multiple requests

Tasks:

• Ensure proper sorting by measuredAt and _id.
• Return sorting criteria along with the search query.
• Update sendExport method to use search_after for pagination.

Example Code:

const sort = [
  { measuredAt: "asc" },
  { _id: "asc" } // Ensuring unique sorting by adding _id
];

return { digitalTwin, searchQuery, sort };

Pros:

• Efficiently handles large datasets by paginating results.
• Avoids Elasticsearch limitations on result size.

Cons:

• Requires proper handling of search_after logic.
• Increases complexity of the search function.

Possible choices to made :

• Use PIT for data consistency but larger impact on ES that have to maintain data state for the search duration
• Do not use PIT as we export past data that should not be reordered between queries (with proper tie breaker on _ids)